A review of the literature on the use of growth-regulatory molecules in the oral cavity permits a model in which to consider approaches to oral tissue engineering. These concepts apply to periodontal regeneration and ...
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A review of the literature on the use of growth-regulatory molecules in the oral cavity permits a model in which to consider approaches to oral tissue engineering. These concepts apply to periodontal regeneration and to regeneration of alveolar bone. In either case, the formation of tissues is complex but proceeds in a deliberate and orderly sequence. In these sequence of events resulting in either bone or cementum formation, periodontal ligament and bone can be stimulated at various points. Different signals can apparently be used to stimulate tissue formation including mitogenic signals and differentiation factors. Additionally, both hard and soft tissue stimulatory molecules appear to be permissive. Classic receptor-mediated peptides or extracellular matrix molecules for soft and hard tissues appear to allow stimulation of tissue formation cascades. Importantly, it also appears that the stimulatory event is transitory (that is, short-lived) and leads itself to a sequence of cellular events. These cellular events in turn stimulate a number of subsequent events (such as chemotaxis, proliferation, differentiation or angiogenesis), which lead to further progression of tissue formation. While a solid scientific rationale exists for the use of a variety of growth and attachment factors in regeneration of oral tissues, only a small number are being pursued clinically. Many therapeutic regimens have failed in preclinical testing or have resulted in limited regenerative capacity. The mitogenic polypeptides that stimulate soft tissue growth (such as platelet-derived growth factor) and both hard and soft tissue growth (such as transforming growth factor-beta) appear to have not led to successful enough outcomes to facilitate further work towards regulatory approval. The demonstrated ability of bone morphogenetic proteins to generate substantial quantities of bone suggest many applications in the oral cavity where this is the only tissue desired. Another therapeutic candidat
目的 探讨旋转脉动磁场对兔实验性牙齿移动过程中牙周组织血小板衍生生长因子A（PDGF-A）表达的影响.方法 30只体重为1.0～1.5 kg的健康新西兰大耳白兔按每组5只随机分为实验1、3、5、7、14、21 d组.2%戊巴比妥钠麻醉下于双侧上颌第一磨牙与切牙间拴结不锈钢螺簧,施力80g,左侧只加力为对照侧,右侧加力加旋转脉动磁场为实验侧,通过免疫组织化学染色进行PDGF-A半定量分析.结果 实验侧牙周组织中PDGF-A表达高于对照侧;实验侧张力区、压力区牙周组织中PDGF-A表达在5、7、14 d时较对照侧差异有统计学意义（5.28±0.14 vs 2.03±0.18,7.63±0.27 vs 2.84±0.12,3.52±0.16 vs 1.65±0.03;8.10±0.13 vs 4.30±0.21,13.27±0.31 vs 6.47±0.15,5.66±0.22 vs 3.15±0.27,P＜0.05）;在7 d时牙周组织PDGF-A表达达到高峰.结论 旋转脉动磁场照射促进了牙周组织中PDGF-A的表达,促进了牙周组织的改建.
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